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Property Plant and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation of property, plant and equipment	$ 73,390,000us-gaap_Depreciation	$ 57,317,000us-gaap_Depreciation	$ 55,049,000us-gaap_Depreciation
Machinery and equipment	659,743,000us-gaap_MachineryAndEquipmentGross	600,848,000us-gaap_MachineryAndEquipmentGross
Accumulated depreciation	567,992,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	563,178,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Minimum non-cancelable future lease payments for year 2015	13,521,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Test Systems Leased By Customers
Property, Plant and Equipment [Line Items]
Machinery and equipment	66,900,000us-gaap_MachineryAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ter_TestSystemsLeasedByCustomersMember
Accumulated depreciation	10,100,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ter_TestSystemsLeasedByCustomersMember
Minimum non-cancelable future lease payments for year 2015	13,900,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ter_TestSystemsLeasedByCustomersMember
Minimum non-cancelable future lease payments beyond 2015	$ 0ter_OperatingLeasesFutureMinimumPaymentsDueYearOneThereafter / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ter_TestSystemsLeasedByCustomersMember

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- Definition

Operating Leases, Future Minimum Payments, Due Year One Thereafter

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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-Publisher FASB

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Paragraph 2

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